https://git.ruby-lang.org/ruby.git/commit/?id=ba6f087944

From ba6f0879448ebc80c7a595c369c59b6d8dfbdf3e Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@r...>
Date: Sat, 20 Mar 2021 13:33:52 +0900
Subject: merge revision(s) abe2e7de4d1f2d5861d7c9ab9c7e778f2ee1dcd2: [Backport
 #16774]

	Don't require sub-word atomics

	On some architectures (like RISC-V) sub-word atomics are only available
	when linking against -latomic, but the configure script doesn't do that,
	causing the atomic checks to fail and the resulting ruby binary is
	non-functional.  Ruby does not use sub-word atomic operations, rb_atomic_t
	is defined to unsigned int, so use unsigned int when checking for atomic
	operations.
	---
	 configure.ac | 4 ++--
	 1 file changed, 2 insertions(+), 2 deletions(-)
---
 configure.ac | 4 ++--
 version.h    | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 9077f4b..1ec13bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1457,7 +1457,7 @@ AS_IF([test "$GCC" = yes], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L1457
     ])
 
     AC_CACHE_CHECK([for __atomic builtins], [rb_cv_gcc_atomic_builtins], [
-	AC_TRY_LINK([unsigned char atomic_var;],
+	AC_TRY_LINK([unsigned int atomic_var;],
 		    [
 			__atomic_exchange_n(&atomic_var, 0, __ATOMIC_SEQ_CST);
 			__atomic_exchange_n(&atomic_var, 1, __ATOMIC_SEQ_CST);
@@ -1472,7 +1472,7 @@ AS_IF([test "$GCC" = yes], [ https://github.com/ruby/ruby/blob/trunk/configure.ac#L1472
     ])
 
     AC_CACHE_CHECK([for __sync builtins], [rb_cv_gcc_sync_builtins], [
-	AC_TRY_LINK([unsigned char atomic_var;],
+	AC_TRY_LINK([unsigned int atomic_var;],
 		    [
 			__sync_lock_test_and_set(&atomic_var, 0);
 			__sync_lock_test_and_set(&atomic_var, 1);
diff --git a/version.h b/version.h
index fac9ec3..ee50c12 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L2
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 3
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 165
+#define RUBY_PATCHLEVEL 166
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 3
-- 
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